Uwell Caliburn IronFist L | Review

Is this the best Caliburn yet?

The Caliburn name needs no introduction; there have already been several devices in the range that adorn many of the best pod vape lists.

The Caliburn Ironfist L pod kit by Uwell aims to continue this trend but comes with a unique style and improved features.

The Ironfist comes with an in-built 690mAh battery, 3 adjustable voltage settings, and precision airflow adjustment.

The pod for the Ironfist L has a 2.5ml capacity and is compatible with the impressive G series coils. There’s a 0.8Ω and 1.2Ω included in the kit.

The Uwell Ironfist L pod system is available in 3 colors: Coral Red, Metallic Silver, and Matte Black.


  • Sleek & unique design
  • Compact
  • Excellent build quality
  • 3 adjustable power settings
  • Versatile airflow – (good MTL range)
  • Excellent Auto-draw
  • Fantastic flavor from both coils
  • Caliburn G Coil Compatibility
  • No leaking or dry hits
  • Comfortable mouthpiece
  • USB Type-C fast charging (2A)


  • No top-fill system
  • Pod attachment, is not the best
  • 690mAh battery falls short compared to others on the market

The Bottom Line

The Caliburn IronFist L is lacking in some departments, like the 690mAh battery is a little low, and there’s no easy-to-use top-fill system. However, it delivers in every other aspect. It has an excellent stylish design, adjustable power, adjustable airflow, and, most importantly, delivers a fantastic flavorful vape from the included coils. I think it’s the king of the Caliburn line – highly recommended.

Specs and Features

Uwell Caliburn IronFist L Specifications

  • Size: 46.5×17.6×69.7mm
  • Battery: 690mAh (internal)
  • Output: 16W Max – 3 power levels
  • Display: LED indicators
  • Resistance range: Not specified
  • USB Type C port – 2A charge rate
  • Pods: Refillable, replaceable coils
  • Capacity: 2.5ml (Standard)
  • Compatible with Caliburn G / G2 coils
  • Adjustable airflow
  • Side fill
  • Auto draw activation

Uwell Caliburn IronFist L Kit Contents

  • Uwell Caliburn Ironfist L device
  • Pod (2.5ml)
  • UN2 Meshed-H 0.8Ω Caliburn G coil (installed)
  • UN2 Meshed-H 1.2Ω Caliburn G2 coil
  • USB Type C cable
  • User manual

Design & Build Quality 

When it comes to design, Uwell certainly hasn’t skimped on any detail with the Caliburn IronFist. Its sleek and compact design is immediately striking when you remove it from the box.

Its footprint is akin to the Caliburn Koko, albeit the IronFist presents a different aesthetic approach with a harmonious blend of metal and plastic. It also feels much more premium and robust in the hand, with its main body crafted from what feels like zinc alloy.

I absolutely love the balance in the design of the IronFist. There’s a great combination of metal and plastic from the pod that blends together seamlessly. Then the branding adds an extra touch of style. There’s a subtle Uwell logo and a more in-your-face ‘IronFist’ sketched on the side of the device.

Even though the Ironfist has a familiar box-style design like the KoKo or AK3, how the pod section bulges out to one side gives it such a unique look. The curved edge of the pod section also makes it pleasant to rest in your palm, and it’s so compact it can be easily concealed as you’re vaping.

There are a few other touches to the device’s design, with a place to hook up a lanyard in the top corner. Then a three-bar LED indicator and a voltage selection button are on the front side. Each is subtly integrated into the device to not disrupt its overall visual appeal.

The Caliburn IronFist doesn’t just excel in looks; it also brings excellent functionality. For example, it incorporates a USB Type-C charging port at the bottom for fast, efficient charging. The precision airflow adjustment control is also on the device’s base – which works excellently (more on this later).

However, there’s a little room for improvement, particularly with how the pod attaches to the device. It uses magnets – two, to be precise – along with a small tab. Although it’s a clever design decision, the connection feels a tad too loose, and the pod has a somewhat clunky feel. In addition, there’s no top-fill system, just a port on the side of the pod that gets concealed when the pod is attached.

I understand why Uwell went with this fill method to keep the whole device looking sleek and to enable them to have a compact and extremely comfortable mouthpiece for MTL vaping. It’s just a shame, as they’ve implemented top fill so well in their other device.

That said, it’s a minor setback in an otherwise beautifully designed product. 

There are only currently a few color options for the IronFist available, and we have all in for review. I think they all look fantastic, but I am particularly drawn to the more sophisticated look of the Matte black variant with that punch of green from the ‘IronFist’ logo.

Overall I’m really impressed with the design and build quality of the Uwell IronFist L pod kit. The styling and finish on the product are top-notch, and it’s certainly a welcome departure from some of the more bland designs on the market.


The Caliburn IronFist is packed with features for such a compact pod system.

The device boasts a built-in 690mAh battery, which delivers a maximum power output of 16W.

The Ironfist will recognize the resistance of the coil attached and set the appropriate power. However, it also comes with a 3-level voltage adjustment to give you more control over the intensity of the vapor and flavor.

A quick succession of clicks on the power button lets you cycle through voltage settings of Low (3.2V), Medium (3.4V), and High (3.6V).

The device can also be switched on and off with 5 clicks of the power button, which prevents accidental firing when traveling.

The Ironfist utilizes auto-draw firing, and the trigger works perfectly, firing instantly upon inhaling.

In addition to adjustable power, the Ironfist also has adjustable airflow. The adjustment slider located on the device’s base can go from completely closed, providing a tight MTL draw. When fully open, I would classify it as an open MTL draw bordering on restricted DTL.

The airflow control switch is implemented well and stays in place when adjusted.

The Ironfist also supports fast USB-C charging, with a charge rate of 2A.


The pod that comes with the Ironfist L holds 2.5 mL of liquid, which is an ample capacity for a device of its size.

As previously mentioned, it has a fill port on the back side of the pod. So the pod must be removed from the device whenever you wish to refill it.

The fill port is large enough to accommodate large bottle tips, and the rubber plug is easy to open and close.

The coils for the pod slot into the base of the pod, and it is compatible with Uwells Caliburn G/G2 coils. There are two included in the kit:

  • 0.8Ω – FeCrAl UN2 Meshed-H CALIBURN G Coil
  • 1.2Ω – FeCrAl UN2 Meshed-H CALIBURN G2 Coil

It can also be used with the 1.0Ω CALIBURN G Coil, but you would need to purchase this separately.


When it comes to performance, the Caliburn IronFist is an absolute winner in my book and is now my favorite of the Caliburn range.

Let’s start with flavor delivery. The Caliburn G coils, well-loved in the vaping, come into their own in the IronFist. The flavors from my juice were full-bodied, well-defined, and consistent puff after puff. I’ve tried it with various PG/VG ratios, and the quality was never compromised.

The IronFist seemed to extract every nuance of flavor, particularly when the voltage setting and airflow were dialed into my sweet spot. That is the fundamental winning feature here with the IronFist – a tailored vape.

Other Caliburns pod devices either have ‘take it or leave it’ airflow, or their adjustability is limited.

The ability to fine-tune your draw from a tight MTL to an open MTL (or very restricted direct-lung) inhale and adjust the power is excellent.

When compared to other devices in the Caliburn range, such as the Caliburn G or Koko Prime, the IronFist’s airflow is smoother and more satisfying. This is not just down to the precision control of the airflow adjustment but also the design of the integrated mouthpiece.

I think it’s the best Caliburn for those that like a tight MTL draw. On the flip side, however, don’t expect to get a DTL vape from the IronFist. It is very restricted at best, even when fully open.

The adjustable power settings work well with the IronFist. There is definitely a notable difference between each setting. I found it to be a little more pronounced with the 0.8Ω coil, but it’s still present with the 1.2Ω

Another not-so-strong point about the Caliburn Ironfist is its battery.

However, the 690mAh battery, while smaller than I’d ideally like, has enough stamina to get you through most of the day on moderate usage. The quick-charge feature also means you’re never too long out of action. 

That being said, I did find myself wishing it held a larger battery (like some of its competitors) for that extra peace of mind, but that’s a minor gripe in the scheme of things.

When it comes to usability, the IronFist is user-friendly and straightforward. The draw-activation works flawlessly. This is something that Uwell has always excelled at, and the IronFist is no exception.

All in all, the performance of the Caliburn IronFist far exceeded my expectations. It outperforms other devices in the Caliburn line when considering the balance of flavor, airflow, and usability. 

It has swiftly become a favorite of the Caliburn range and the home for all my G/G2 coils.


The Uwell Caliburn IronFist offers an impressive blend of good styling, robust build quality, useful features, and high-caliber performance. 

It’s a testament to Uwell that the Calibuirn line is a mainstay in the top echelons of the pod market commitment, and the IronFist is elevating them to a new level.

While the battery life leaves a little to be desired, it’s a compromise I’m willing to accept, given the excellent flavor reproduction, the adjustable airflow, and the overall ease of use. 

The IronFist is a suitable device for newcomers due to its simplicity and usability and for seasoned vapers, who will appreciate its performance and the flexibility afforded by the Caliburn G coil compatibility.

The Uwell IronFist L lives up to the legendary status of the Caliburn line and even exceeds it in certain aspects. In a crowded market, the IronFist manages to make a strong statement, and it’s one I wholeheartedly recommend.




The Caliburn IronFist L is lacking in some departments, like the 690mAh battery is a little low, and there's no easy-to-use top-fill system. However, it delivers in every other aspect. It has an excellent stylish design, adjustable power, adjustable airflow, and, most importantly, delivers a fantastic flavorful vape from the included coils. I think it's the king of the Caliburn line - highly recommended.
Marc Panayiotis
Marc Panayiotis
Marc Panayiotis, co-founder of our vaping website, combines over 10 years of expertise and a deep understanding of 1000+ products to establish our platform as a reliable industry resource and inspire our team.

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The Caliburn IronFist L is lacking in some departments, like the 690mAh battery is a little low, and there's no easy-to-use top-fill system. However, it delivers in every other aspect. It has an excellent stylish design, adjustable power, adjustable airflow, and, most importantly, delivers a fantastic flavorful vape from the included coils. I think it's the king of the Caliburn line - highly recommended.Uwell Caliburn IronFist L | Review